test-repo/changelog_unreleased/javascript/pr-8453.md

Support record and tuple syntax (#8453 by @fisker)

Support Stage-1 proposal JavaScript Records & Tuples Proposal.

Only support #[]/#{} syntax, not {| |} / [| |].

Tuples

// Input
#[1, 2, 3]

// Prettier stable
SyntaxError: Unexpected token (1:1)
> 1 | #[1, 2, 3]
    | ^


// Prettier master
#[1, 2, 3];

Records

// Input
#{
  a: 1,
  b: 2,
  c: 3,
}

// Prettier stable
SyntaxError: Unexpected token (1:1)
> 1 | #{
    | ^
  2 |   a: 1,
  3 |   b: 2,
  4 |   c: 3,


// Prettier master
#{
  a: 1,
  b: 2,
  c: 3,
};